Helpful tips

How do I setup reverse DNS for email server?

How do I setup reverse DNS for email server?

Create a reverse DNS record

  1. Log in to the Cloud Control Panel.
  2. In the top navigation bar, click Select a Product > Rackspace Cloud.
  3. Select Servers, then click the link for your Cloud Server from your Servers List.
  4. On the Server Details screen, click Add Record next to the Reverse DNS.
  5. In the Add Record pop-up window:

Is Reverse DNS important for email?

There are many security measures that your domain needs to pass in order for your emails to reach your clients’ inboxes. Reverse DNS is the biggest deliverability killer, as almost all mail servers use this method to verify incoming domains.

What is Reverse DNS email?

What is reverse DNS? Setting up reverse DNS on an IP address allows mailbox providers to verify the sender when they do a reverse DNS lookup upon receipt of the emails you send.

How do I create a reverse DNS PTR record?

To create the PTR Record:

  1. Add a new PTR record.
  2. For the Canonical Hostname, enter the domain you’d like the IP address to resolve.
  3. After you’ve saved your file zone, allow time for the change before validating the new reverse DNS record.

How do I setup a mail server for PTR records?

To create a PTR Record, complete the following:

  1. From the Cloud Services Portal, click Manage -> DNS -> Zones.
  2. Click the DNS view.
  3. Click the zone.
  4. Click Create -> Record and select PTR Record from the drop-down list.
  5. On the Create PTR Record page, select or specify the following:
  6. Click Save & Close to save.

Do I need to setup reverse DNS?

The most common reason for establishing a reverse DNS is for outbound e-mail servers. Since a reverse DNS record adds further tracing to the origin of an e-mail, it also adds credibility to the e-mail server itself.

Where is reverse DNS used?

Reverse DNS is mainly used to track the origin of a website visitor, the origin of an e-mail message, etc. It is usually not as critical as the classic DNS, visitors will reach the website even without the presence of reverse DNS for the IP of the web server or the IP of the visitor.

How do I fix reverse DNS?

Correct reverse DNS entries

  1. Make sure that your reverse DNS record matches the host name of your server.
  2. Make sure that a regular DNS lookup for the domain you have designated as the reverse DNS record entry returns the IP address in question. For example: If 70.32. 86.172 has a reverse DNS record of

Do I need reverse DNS?

Reverse DNS is mostly used by humans for such things as tracking where a web-site visitor came from, or where an e-mail message originated etc. It is typically not as critical in as forward DNS – visitors will still reach your web-site just fine without any reverse DNS for your web-server IP or the visitor’s IP.

How do I fix reverse DNS problems?

Is PTR record necessary for mail server?

Many mail servers will perform a reverse DNS lookup on the IP address that is attempting to connect to them. Therefore the mail server needs to have a PTR record associated with the IP address that it uses to communicate with other servers.

How do I set up reverse DNS for my mail server?

Contact your ISP (or whoever owns your IP block) and request a zone for your mail server’s IP address. This zone is actually a special reverse DNS domain that ends in “”. The numbers that precede the “” are actually your IP block with the octets reversed.

Do you need to create a reverse DNS zone?

A very important thing to note, you must create the reverse DNS zone on the authoritative DNS nameserver for the main IP address of your server. You can find out which nameserver is the authoritative server by entering the IP address you’re trying to configure into the DIG Web Interface.

Do you need a Dyn for reverse DNS?

This is the most common type of reverse DNS delegation, and requires a separate Dyn Standard DNS zone. For example, let’s assume you have a /28 block of IP addresses beginning at the address There are four steps to delegating this block to us:

How to create a DNS zone for

For example, let’s assume you have a DNS zone for and wish to delegate two IP addresses to it: ( and ( There are two steps: 1. Ask your ISP to create CNAME records pointing to PTR records in your DNS zone, one for each IP address, following this format: 2.